Hummer 2004 H2 User Manual download pdf (Page 320)

California Fuel

If your vehicle is certiﬁed to meet California Emission

Standards (see the underhood emission control label), it

is designed to operate on fuels that meet California

speciﬁcations. If this fuel is not available in states

adopting California emissions standards, your vehicle

will operate satisfactorily on fuels meeting federal

speciﬁcations, but emission control system performance

may be affected. The malfunction indicator lamp may

turn on (see Malfunction Indicator Lamp on page 3-38 )

and your vehicle may fail a smog-check test. If this

occurs, return to your authorized GM dealer for

diagnosis. If it is determined that the condition is caused

by the type of fuel used, repairs may not be covered

by your warranty.

Additives

To provide cleaner air, all gasolines in the United States

are now required to contain additives that will help

prevent engine and fuel system deposits from forming,

allowing your emission control system to work

properly. You should not have to add anything to your

fuel. However, some gasolines contain only the

minimum amount of additive required to meet U.S.

Environmental Protection Agency regulations. General

Motors recommends that you buy gasolines that

are advertised to help keep fuel injectors and intake

valves clean. If your vehicle experiences problems due

to dirty injectors or valves, try a different brand of

gasoline.

Gasolines containing oxygenates, such as ethers and

ethanol, and reformulated gasolines may be available in

your area to contribute to clean air. General Motors

recommends that you use these gasolines, particularly if

they comply with the speciﬁcations described earlier.

Notice: Your vehicle was not designed for fuel that

contains methanol. Do not use fuel containing

methanol. It can corrode metal parts in your fuel

system and also damage the plastic and rubber

parts. That damage would not be covered under

your warranty.

Some gasolines that are not reformulated for low

emissions may contain an octane-enhancing additive

called methylcyclopentadienyl manganese tricarbonyl

(MMT); ask the attendant where you buy gasoline

whether the fuel contains MMT. General Motors does not

recommend the use of such gasolines. Fuels containing

MMT can reduce the life of spark plugs and the

performance of the emission control system may be

affected. The malfunction indicator lamp may turn on. If

this occurs, return to your authorized GM dealer for

service.

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Hummer 2004 H2 User Manual Page 320

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